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The pion transition form factor and the pion distribution amplitude

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The pion transition form factor and the pion distribution amplitude

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dc.contributor.author Noguera Puchol, Santiago
dc.contributor.author Vento Torres, Vicente
dc.date.accessioned 2014-03-20T12:49:02Z
dc.date.available 2014-03-20T12:49:02Z
dc.date.issued 2010
dc.identifier.citation Noguera Puchol, Santiago Vento Torres, Vicente 2010 The pion transition form factor and the pion distribution amplitude European Physical Journal A 46 197 205
dc.identifier.uri http://hdl.handle.net/10550/33630
dc.description.abstract Recent BaBar data on the pion transition form factor, whose Q(2)-dependence is much steeper then predicted by asymptotic Quantum Chromodynamics (QCD), have caused a renewed interest in its theoretical description. We present here a formalism based on a model-independent description for low photon virtuality and a high photon virtuality description based on QCD, which match at a scale Q(0). The high photon virtuality description incorporates a flat pion distribution amplitude, phi(x) = 1, at the matching scale Q(0) and QCD evolution from Q(0) to Q > Q(0). The flat pion distribution is connected, through soft pion theorems and chiral symmetry, to the pion valence parton distribution at the same low scale Q(0). The procedure leads to a good description of the data, and by incorporating additional twist-three effects, to an excellent description of the data.
dc.relation.ispartof European Physical Journal A, 2010, num. 46, p. 197-205
dc.subject Partícules (Física nuclear)
dc.subject Física nuclear
dc.title The pion transition form factor and the pion distribution amplitude
dc.type journal article es_ES
dc.date.updated 2014-03-20T12:49:02Z
dc.identifier.doi 10.1140/epja/i2010-11029-6
dc.identifier.idgrec 063307
dc.rights.accessRights open access es_ES
dc.identifier.url 10.1140/epja/i2010-11029-6

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